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SN75176组成的RS485电路与其它485电路组网连接时，会烧TVS管、串联的10ohm，还有SN75176B芯片，RS485之间是不共地，只连接两根线，请问是什么原因才会导致这种情况？
特别是这两个10ohm电阻经常烧毁。
电路如下：
